I managed to suppress most of the 'Too many vertex format changes in frame' errors by optimization with heavily deoptimizating (dividing visleafs smaller and smaller, to hide everything not visible), deleting cubemaps and adding areaportals. As long as the player will not fly around or crawl up the walls there should be no red flood on console. Also tweaked some lighting and prop display distance.
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Also added three new screens under images.
But it is time for new challenges - something with all custom content.
